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CVE-2021-35395: Realtek AP-Router SDK Buffer Overflow Vulnerability

criticalknown exploitedpublic exploitCVE-2021-35395
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Realtek AP-Router SDK HTTP web server boa contains a buffer overflow vulnerability due to unsafe copies of some overly long parameters submitted in the form that lead to denial-of-service (DoS).

CSIRTS triage

vendor: Realtekproduct: AP-Router SDKDenial of service
What
A buffer overflow vulnerability in the HTTP web server can lead to denial-of-service conditions.
Who is affected
Deployments using Realtek AP-Router SDK are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest updates for the Realtek AP-Router SDK.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-35395

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-35395coverage & exploitation statusNVD · CVE.org

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